| The Big Deuce - Designations |
|
1953 - 1962 |
1962 - |
Operator |
Remark |
|
S-56 |
S-56 |
- |
Sikorsky model designation |
|
XHR2S-1 |
- |
Navy / Marines |
Experimental version |
|
HR2S-1 |
CH-37C |
Navy / Marines |
Production version |
|
HR2S-1W |
- |
Navy / Marines |
AEW version |
|
YH-37A |
- |
Army |
Service test version |
|
H-37A |
CH-37A |
Army |
Production version |
|
H-37B |
CH-37B |
Army |
Upgraded production version |
|
Before 1962 US military services had different designation systems for their aircraft. On September 18, 1962 a common designation system was adopted for all services, and all Navy/Marines Corps/Coast Guard aircraft were redesignated according to the new system, as well as Army aircraft. |